Question

The general term of a sequence is given. Determine whether the given sequence is arithmetic, geometric, or neither. If the sequence is arithmetic, find the common difference; if it is geometric, find the common ratio. an = 4n - 2
A. arithmetic, d = -2

B. geometric, r = 4

C. arithmetic, d = 4

D. neither

Answer 1

@cobra-strikes

Answer 2

@dan815 @Hayleymeyer @cobra-strikes

Answer 3

oh wow o_o

Answer 4

yep this is pre calc 12 grade math haha

Answer 5

@ganeshie8

Answer 6

man, i get help you with that XD, are you good in spanish?

Answer 7

yes

Answer 8

omg i love you! can you please help?!

Answer 9

after my quiz breh

Answer 10

@paki @Ashleyisakitty

Answer 11

what is a1?

what is a2?

what is a3?

what do the terms change by each time?

Answer 12

idk

Answer 13

when n=1 what is a1? plug in 1 and find out

Answer 14

is it 2

Answer 15

and how did you get that?

Answer 16

i plug in one

Answer 17

4(1) - 2 = 4 - 2 = 2.

so what is a2?

Answer 18

idk this is so confusing

Answer 19

4(2) - 2 = ?

Answer 20

-6

Answer 21

-6? 4(2) -2 = 8 - 2 = ?

Answer 22

the nth term of arithmetic sequence an = a1 + d(n-1) where d = common difference and a1 = first term

Answer 23

now that makes more sence

Answer 24

@cobra-strikes

Answer 25

compare that general form to an = 4n - 2

Answer 26

ok and what do you mean by that

Answer 27

an = a1 + d(n -1)

an =(a1 - d) + dn

an = -2 + 4n

Answer 28

comparing coefficients d = ?

Answer 29

-2

Answer 30

@welshfella

Answer 31

i guess that looks a bit confusing with the repeated d but its the last d which gives the common difference so d = 4

Answer 32

a1 - d = -2

so if d = 4

a1 = 2 = first term

Answer 33

the sequence is arithmetic
2 , 6 , 10 .....